TY - JOUR
T1 - Modified TS-1 for shape selective phenol hydroxylation to hydroquinone
AU - Mal, N. K.
AU - Kumar, P.
AU - Sasidharan, M.
AU - Matsukata, M.
PY - 2004
Y1 - 2004
N2 - A new method of modification of TS-1 by weak base (aqueous NH3) treatment leads to formation of bigger crystals and generation of internal hydroxyl groups as evident by SEM and IR (hydroxyl region). All the catalysts were characterized using, XRD, N2-sorption, UV-VIS, FT-IR and SEM. Activity of the modified and unmodified TS-1 were compare in the hydroxylation of phenol to hydroquinone and catechol in presence of aqueous H 2O2. A ratio of hydroquinone to catechol over modified, (TS-1(33)/OH1 and unmodified, TS-1(33) catalysts were 1.40 and 1.15, respectively, using H2O as solvent, and 2.01 and 1.68, respectively, using MeOH as solvent. Modification of TS-1 with strong base (e.g. NaOH) causes decrease in crystallinity, and hence decreases the conversion of phenol and selectivity of hydroquinone. A new mechanism controlling the product selectivity is proposed.
AB - A new method of modification of TS-1 by weak base (aqueous NH3) treatment leads to formation of bigger crystals and generation of internal hydroxyl groups as evident by SEM and IR (hydroxyl region). All the catalysts were characterized using, XRD, N2-sorption, UV-VIS, FT-IR and SEM. Activity of the modified and unmodified TS-1 were compare in the hydroxylation of phenol to hydroquinone and catechol in presence of aqueous H 2O2. A ratio of hydroquinone to catechol over modified, (TS-1(33)/OH1 and unmodified, TS-1(33) catalysts were 1.40 and 1.15, respectively, using H2O as solvent, and 2.01 and 1.68, respectively, using MeOH as solvent. Modification of TS-1 with strong base (e.g. NaOH) causes decrease in crystallinity, and hence decreases the conversion of phenol and selectivity of hydroquinone. A new mechanism controlling the product selectivity is proposed.
KW - Hydroquinone
KW - Microporous zeolite
KW - SEM
KW - Titanium silicate-1
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U2 - 10.1016/s0167-2991(04)80532-9
DO - 10.1016/s0167-2991(04)80532-9
M3 - Article
AN - SCOPUS:11844281495
VL - 154 C
SP - 2618
EP - 2625
JO - Studies in Surface Science and Catalysis
JF - Studies in Surface Science and Catalysis
SN - 0167-2991
ER -